IPA: /ˈtrɛndɪnəs/
KK: /ˈtrɛndɪnəs/
The quality or state of being fashionable or popular at a particular time.
The trendiness of the new clothing line attracted many young customers.
Trendiness → It is formed from "trend" (from Middle English *trende*, meaning to turn or revolve) and the suffix "-iness" (meaning the quality of being). The word "trendiness" refers to the quality of being in vogue or fashionable, as it relates to the turning of styles and preferences.
Think of the word 'trend' as something that 'turns' in fashion, and '-iness' means the quality of that turning. So, trendiness is all about the quality of being fashionable.